A Wavelength Selective Output Folded Unstable Cavity for Hydrogen Fluoride Laser

Abstract

The invention relates to a hydrogen fluoride laser wavelength selective output folded unstable cavity. The resonant cavity includes a convex reflector, a 45-degree polarized reflector, a 45-degree total reflector and a concave reflector. Among them, the reflective surfaces of the convex reflector and the concave reflector are respectively coated with a reflective film with high transmission of short wavelength light and high reflection of long wavelength light. Reflective film with high reflection of wavelength light. The selective output of laser light with different wavelengths is realized by utilizing the different reflectivity of the optical elements in the cavity to the oscillating light of different wavelengths in the cavity. By setting the position of the optical element in the cavity, the beam rotation of the resonant light in the cavity along the airflow direction is respectively realized, and the spatial distribution uniformity of the output light spot is improved. The resonant cavity has a simple structure and can realize uniform output of a hydrogen fluoride laser single spectral line.

Description

technical field [0001] The invention belongs to the field of chemical lasers, in particular to a resonant cavity of a hydrogen fluoride laser. Background technique [0002] The hydrogen fluoride laser can directly convert the chemical energy generated by the initial chemical reaction into stimulated radiation energy, and obtain huge laser power. It is the laser with the highest output power applied so far. The hydrogen fluoride laser works in the wavelength range of 2600nm-3000nm, and the output spectrum is rich and usually multi-spectrum operation. However, in practical applications, some specific wavelength single-spectrum laser is often required. In this case, the line selection output of the laser is become very necessary. [0003] Using a grating cavity is a common method for multispectral lasers to achieve precise single-line laser output. However, for high-power hydrogen fluoride lasers, it is difficult to obtain a blazed grating with a large area and a high damage t...

AI Technical Summary

Problems solved by technology

[0003] Using a grating cavity is a common method for multispectral lasers to achieve precise single-line laser output. However, for high-power hydrogen fluoride lasers, it is difficult to obtain a blazed grating with a large area and a high damage threshold. Aberrations can seriously affect the beam quality of the output laser

Line-selective laser output can also be achieved by using interferometric mode-selective components such as narrow-band filters, F-P etalons, etc., but these types of components are difficult to apply to strong lasers

[0004] When the hydrogen fluoride laser is running, the gain medium of the optical cavity flows at a supersonic speed, and it is easy to produce uneven distribution of the gain medium during the chemical reaction to generate laser light, resulting in uneven distribution of the output laser spot along the airflow direction

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